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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e04a0875b210716901f1d1d78b1eab02f0d86e8b8b6f3d76a996d64a680583' 
  AND token = 'G8qCPsJmiMtI6kyijhQFDqCU55wDvGVawfetjX21pyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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