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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0890cf296e59ac9ab1049cc3012da8d71b7fea683b23dfe8f5ecd0263940a5' 
  AND token = 'qCciRB2yUDeXAt3uRXTiD+iUf4yRxiKKUUDktqOBe+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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