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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456a5890c5658b7e36699438e12a3876cbb67c0acf09b8cece84a4f3592cd0d7' 
  AND token = 'dz2PrCkcx2iKbHlEDQXkQJqFkS7ZO7lB0esV+fCG4jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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