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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6973320d2b77339e291433ac9063e301d177c7fd2d18ec87829e9ced5bd7ea2' 
  AND token = 'MWiAHq+biIg2ktzKt+US2fU2T6w/NxCKpuT0q3EqtAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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