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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0976c4db9e01ff17424a2fb047eda69da0a8439b68b0c49756a6e56d3ec369e5' 
  AND token = 'vK2ujVY1s6863qe37ORY5hGtr9ukMWz7bKDFZUBCTeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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