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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb76f5af441ab7ddcb2f91a07010f6d699304adc00835447ba05df85961aff0' 
  AND token = '9spcHRi8AGgoDX+PKEKN5F1FxiF6d/FpjTPMAPQgWak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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