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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655926ac8ddcae00b0c111232b2e7a30b92f214d4d36a5c57dc5c0d1a83e9a84' 
  AND token = 'H4XwfQ3mpsVQihch/S6mH102mb7Drf7Q96APGHvDcqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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