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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b5a993d1fc7c1ecd814f1ae2cdccddbe8ffcab0fab06e3a314e4b153e94167' 
  AND token = 'zatvdWXKkpX7Xu/WYHZSQY2Ec9t87otg4HUlpP6sjaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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