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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ad474ea2a9081830414aeb93cc028c814aac052e1ad7f8781532bf1e4e8d71b' 
  AND token = 'NzekIirvzLgASmRnaxIdNBGSu+ARCCT7OqYRLmn3wpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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