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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b6c3e842dd801712ecb3a7a823fd0e6a06426bf48089529fd7f01327ff2d5fe' 
  AND token = 'q7ZnBD+Aq99wunKqJ9ZWd3leRC2u43oV3DeSKaAalgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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