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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259ef969ec3bca3c24d48b6d4ae5e5357650d338220da6eb9f8f84ff3673e891' 
  AND token = '7EpT2BpEWj1sx/YuDPhen7X87IrtCOnFKnRgh56heBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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