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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129b6b3131218b61fc41037539e5dd87e60b242a6a989ad44eac8d8dba44ea38' 
  AND token = '/CZRixzg2+AV1x2teZRFATrRKZmx5eQngWO0PGimnL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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