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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eade53ac5c9cbd7241b653f493458455456f84a02834014567c8eae0f3ba312' 
  AND token = '10E/8JlP9s+Om3l68xGoAJF4YYM2y+HB0MiS2sxWJaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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