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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703dbe6c221e98fe3bc2cb86d9f4a3cc7ddbba04b7df266654df0cac01d0e1c4' 
  AND token = 'JCngOT0N7ScfJsyUllkWW43bDnaKkueqRNx0paOwaWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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