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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174fb67e0e57ce0f14e01d1c1e3ae53e840774a1597d62bfe86f7f501e673988' 
  AND token = '/6BTkEprTHI6VqrMm+Exd2ZU1d38w641Ebw+MPdhoFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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