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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350f423f0f477c53c93b2e37774492c3129f503b067e7626d03234d4a5dabe3a' 
  AND token = '2D4u/TqVUX+Pvz2fepGPkya4AkFDCnByspkvdr3XvHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}