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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973a1bca61e20e0003998e8d6474cb133f31b5d4e0551b23c6338ae587da6d89' 
  AND token = '89n6QBH2KeALIxMIvxfj70mddfGJUgYLIMjg6KAJcQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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