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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716de24ff31287f86a7a6aa960ca3eee7f78215d2ac1cd0d50a75c107edb8bd7' 
  AND token = 'HgFTwlgpTPcgGYBBJFRDo95VeoGPqCB8g9jk4J1DyZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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