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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929f33498fae5039452648451542912d71e5c0b5ec94196256eb3ee34efe94b6' 
  AND token = '9XraMf5tSg2tSQJRjykUez38k63H2ttsrCvDFZ2OH2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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