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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356e63e95f362a174d8284cb550490c3635583139ff3244d949b774a295b9adf' 
  AND token = '60jQJrqIc9HPlzr51QotyjtqEEF7BLMgTzMoWBbQYVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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