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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa3e37c2cc88766f58f583291d05d64b0d0d1707611854307641048244157c0' 
  AND token = 'l2REAdGMK+Le+T6fgD+Mu84SYjqfnR+77nqdVAngQ4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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