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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf0b76566e1b64ccdf42a8fedcfbe3de37db9d620960869e1d02f0ecc517f00' 
  AND token = 'VUfobYOs61D+P4LNlpPBn4xIbnj5KcN3NuzJC8UKR8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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