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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e816b4d76f0b8c66ae341b1ba106b951e19594ba5042f36742d075129dac30' 
  AND token = 'bdje9R7+u7cQ+HuicOyTlcs/RM7uIR417VDgKRt7dko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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