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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f95c7dd5ac6fcb1086c3e3da34309d0d40e8c7d3ad5c7601f4a6b5092a974f' 
  AND token = 'fdmMix612m/qLKX0q6RZ/adwBoyqoRBjaq/hNlIELIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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