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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e44e9e58798b262699eebfe976d1301eb84968e1eedd6f810b2ae5bdc404e9e' 
  AND token = '86TQ8rUAVcSea4YnQ6MSoAsvpdy4QLxkCVFP7SRXpXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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