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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d103c2e8acee5d66387ec982e8172d0d58434f9e666d89a471fa0d833c0922a' 
  AND token = 'XLhomGittRFlvK4oU52oXYjhrJFO4FL2v0lOr9f55iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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