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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822f5bac73dfbfc78fb094eacaab63372da77152ff4f4415edaef7b00468fd8c' 
  AND token = 'WFF62zYjbPYqcFryXDoVemKguebWgO6KsDGR6KHHKWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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