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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71359d48be6ca85e93b1faf1b9b7b102a88bd3569c6434aa5e8654ab91e8c31' 
  AND token = 'buMDrs/Gc0MkM7VUrIj86mkfaE3FxJf0IbNeus4flOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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