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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ac8e4e23e81b4cc7f700a13586ccc8ab865104575045bd64f06f3507a644b9' 
  AND token = 'i+qWNvHTiqvUNeJpLE3yK/xb99SQe4I+8IojF2eGq98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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