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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734be5052d469d04363c70ff89981e05c0460fd3d3f8d9c3d72ae43fe67d59f8' 
  AND token = 'G6gzFACTsQYUBWSxyDrnACcCKQdI9eMWjEAQgcOwnDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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