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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99338759f9c8857d9af71e7a794e163936becfb7904c4465ee3ea7030fee2fb5' 
  AND token = 'l8CH/ieAOMEH4/+8hHHCVZ0Sgp0MLIXmQ7inr9DhwZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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