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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e421f693109f63d646e84675c7963e4cb3c1e4e429876f4d7f2872d90e555778' 
  AND token = '/PsVQIl26efZPZ1EROyyRwPqM8bQqABH7NqUM8Wjxa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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