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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9626c6f982ae831ea246cd160d08d0057600c1ab972b2cdf5f9276082611b5bb' 
  AND token = '1BykEd6F+Qgqzw949Uiv/Rq7ycATBJVCJfNhOUNW7qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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