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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6971f8bfb612b28511af81f4cc4bc4e2babd63f09810f4177b3fd6390924c7a' 
  AND token = 'WcmK8uEs4Q5tBqZAUSxv628x7vC3v1r4uOTNqRLWBGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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