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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea53991ef489d71b5bdc0ce4f5c1de4f1434dacb3879e51fe87ed9e9b54736c7' 
  AND token = 'Vri6/FiNY59Psv7sSI7imFh0l9lr/638VhQzm3GYXf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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