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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f9136132f31ec5936f709cf02b512546a03d7658d8db91c2827808a7ca3cab' 
  AND token = 'DlE6Cm3Ebug2NrbdR80ijwNRxkS1DCTulvvBhRz24hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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