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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5beaacdbea94f1da6dd0747930686eb85ba3ee339147cf540b84036765ad0b50' 
  AND token = 'R0Fi4ncXiXg094K7D190ntzDAZs6V5hHHS45v2fSWZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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