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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6bb387545775ddb5a163f3724697f89fce78c35bbdb8ea79ee25a8c447f175' 
  AND token = '2u60r590deGO98nminDxm2fH9vG2Kjvrp6rActYFhjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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