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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292294017068b7f6529c940de7b8a40d835c1483b2ac051ffed9128b9a8084d5' 
  AND token = 'q6qQEuEoZ3hcQLnpY7uOQOJ27Mo/HnQ4sjwkFuWfflQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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