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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d9ab87e3c0fd0e8abb14e55cd8cecc7fb29678e51b5e5e9bf5e30f7ccb08dd' 
  AND token = 'yjVzZQo7Scm6qjEsSp7h4iPXErykUY5gi3vLh/JpeRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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