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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab0e7ec9c725352209da60c62224de436b29f5037d4a67fa70f0eaf1e8d21c8' 
  AND token = 'f+Ceb1iWVmZfcxdMcCBh+40i9EYmwsl2tjeQa9F8Q7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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