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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926c0c327e03af96b24de7429ffedd5b66cfea78ffc1124f70542a52cfc93b67' 
  AND token = 'o9DmQ63eymfQbbZWAZZqZ4uM+e8iONqC0Gj1Wc0dRf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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