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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba4502fccacab2064629e32bc54f98aafdafe3e01355d38029c62141287074c' 
  AND token = '8NuOHuqxkibOtjI2L7j2ii1sdKzGWFP0VOK7bSlhHMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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