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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138052cd1556acc0296c6c5ae7a20de1214c59c0a117e7ad71f6d72613449e18' 
  AND token = 'xk+2L25f5hGeJWfL9Lze20KK7/xqSsjsyUTu8KkWmj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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