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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc2e736bd729b1578e79457b79c7c5450a6d8508b25478c43680b8cc93ecebe' 
  AND token = 'c8AOe/HsvcjEmozivEz0xFzHWfn6As2St9uGz47POFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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