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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa044fca33bf9d81a5c794f41052295b0dbf93e482938161e7341f6ab32a36c' 
  AND token = '8SJgBXV5aAvojcpfbWVpUXdRJrGyfz7azk0kXwfdbAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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