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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f5a504be71f23dabdbbcb44b8e730dbec478f71827e925082f00dc320b34f9' 
  AND token = '4Yzyzc3cY/S22TW/Gne0My/CluCxO7f0TYqbc8d30zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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