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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a26da93e9183696cf09ca00ac2c10d5f907cbf3552e4b365ac672341d8f35d1' 
  AND token = '7BPFyhpjN1luiAe6424X2UIh2zLCSuM3FFfZi5kUahQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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