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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7182d0ef83c6cd3367602a681991a55aa2b3284008421dc849b94d427790a7' 
  AND token = 'jAzcZoKs5BU4Zm12eqlHpb5qp28ZAuJPCPHNU4UO2lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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