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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1daa35f3841b36ec6eac88f225e6af26b3e93da9765ec26ee4c788b3c93398' 
  AND token = 'j7KTvnhJTWjnUzLcmoi+jF8U+717K7Bcy/ITBw2Ibk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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