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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ee42c0cb04f52ae70bd6a8e6e2e0fb56f9656fb2dc29b6e28f55b23fb55c30' 
  AND token = 'fLph54oFmhGSNM+7LpLUmxsV3z8aPt5qpMTIZ06hKuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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