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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8dcfb1d4acec166d29f15b23a349701c7ca7b950a8d4d1e1838cab00e9cbae7' 
  AND token = 'xeVG2YKyQK35nenktcrkoG913ejpyjs0eClk3GEr9j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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