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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac67e87bccea5ea4a40ced3c40e0857bbf8b0dca65e7b0cdb51f9ee226fc2c8' 
  AND token = 'Tr8cl1HB41TzjggLFD9dCAyRLf8wATY5leUaZHlMWKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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