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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c0e820584d5cdb2a4bb1492fa3e57ee88d951238fa1c7177dc3378e3d0aad8' 
  AND token = '9/+u7hnWLMqi63nZeLFbwfQm7EnvENnypGdlyn6HefU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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