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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5319d05258fd05c501e4e5be291d7abcfa04c999a4d0903d4ab64116d211f91' 
  AND token = 'MXMtTb6Uqo+a47GbszKMkj2YftwSJgOzt5/1tUasvAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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