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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada1c7e0b6702846ae1b5a8d418ae3995171a01b8065b0ae0be0af1c5473ae5f' 
  AND token = '8sLIH5TeBKeWMoVMhplLbjhTXyB2VyJlK3Q6NjP+AqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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