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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62413579e0cb3b69e80f6742a260c92e7a26c919f1757e97b174f1a6e7147372' 
  AND token = 'acmFZkeswZGEhDMa6EEAd03FC++C6MLj6ND2HbigzSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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