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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7b93350e82091b8890152e0cf9daf4ad4094e94b65db20376493240a9abd0a' 
  AND token = 'Idxfr1I80k5Naduc3TgF7oPt2mskhaBaxuJGQ7Ld8jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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