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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eafe255f29a5c74183d4c122df667750b56aadf9f7c0257d93b5dc728be6a15b' 
  AND token = '7u6jG9RHTwOMmY+31hOcBp+R6loiHr6cMNrY10blUCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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