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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb067448722cb17aea3a5013470567d9cba8865bcdd0b1b48c3a18b477d4c1fe' 
  AND token = 'J6G5586PP8jzjWHUMv85s9TQfyXJkV+iQ8kGP4C0T2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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