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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64ed325131dce2dcf857b6b967c0b9ef170fa2cb93506db6512a829b9b3e230' 
  AND token = 'GcihJBxay3yMOInssskiXtpxCvDrPULUJy8YgYb9mdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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