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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34de6c6c96bcf7d019505f7de2dfdb1229589ea5101dff43c96c1fa8ca873641' 
  AND token = '4UWptwXY9rL1t0xdRpJxTlFAy4yoD7M9JmVY2pjTYgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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