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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05097962b44caa325fef556f3dd3bf8400955d9465755a4f0203e2d8f7923914' 
  AND token = 'IooTkEnsguhUM3BcZYgF6BEnVHy+O/pyY1fAAuY8NFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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