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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3049b5f7db889aff3f2ef220b8f07e9223ca146b9d1ac19e325258a3922502f3' 
  AND token = 'BgPkeKawu1nY58p5MvSI/RQ3cp/0i79VZO0rNwqodQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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